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gas_handling_system [2017/06/07 13:13] pereira [Removing Gas from Focal Plane Detectors] |
gas_handling_system [2018/12/19 11:04] pereira [Detector gas handling system] |
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====== Detector gas handling system ====== | ====== Detector gas handling system ====== | ||
- | * [[#General information]] | + | * [[#General information |
- | * [[#LabView Control Program]] | + | * [[#LabView Control Program |
- | * [[#Preparation of Gas bottles|Preparation of Gas bottles for filling of detectors]] | + | * [[# |
* [[#Filling Ion Chamber with Gas]] | * [[#Filling Ion Chamber with Gas]] | ||
* [[#Filling CRDC1 and CRDC2 with Gas]] | * [[#Filling CRDC1 and CRDC2 with Gas]] | ||
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* [[#Tracking Gas bottles pressures|Tracking Gas bottles pressures from Barney]] | * [[#Tracking Gas bottles pressures|Tracking Gas bottles pressures from Barney]] | ||
* [[# | * [[# | ||
+ | * [[Venting/ | ||
+ | |||
+ | ===== General Information for focal-plane gas handling system ===== | ||
+ | The gas handling systems for both Focal Plane gas-filled detectors – the [[Detectors# | ||
+ | |||
+ | Note that since the same roughing pump drives the gas handling systems for both gas-filled detectors, extra precautions must be taken to protect one detector from the pressure of the other detector. The fact that the same pump drives both systems is not indicated on the graphics for the LabView control application | ||
- | ===== General Information ===== | ||
Required controls and monitoring | Required controls and monitoring | ||
* LabView gas handling system application **FPGHS_TCPIP-II.vi** | * LabView gas handling system application **FPGHS_TCPIP-II.vi** | ||
* PanelMate **S800vac.ui page 07**: Focal Plane Detector | * PanelMate **S800vac.ui page 07**: Focal Plane Detector | ||
- | The gas handling systems for both Focal Plane gas-filled detectors – the [[Detectors# | + | ===== LabView Control Program |
- | + | ||
- | Note that since the same roughing pump drives the gas handling systems for both gas-filled detectors, extra precautions must be taken to protect one detector from the pressure of the other detector. The fact that the same pump drives both systems is not indicated on the graphics for the LabView control application | + | |
- | + | ||
- | ===== LabView Control Program ===== | + | |
To start the gas handling system control application, | To start the gas handling system control application, | ||
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- | ===== Preparation of Gas bottles ===== | + | ===== Preparation of Gas bottles |
==== In Data-U6 ==== | ==== In Data-U6 ==== | ||
* Ensure **I265GV** is closed (in PanelMate **S800vac.ui page 07**) to isolate focal plane vacuum chamber from the rest of the beamline | * Ensure **I265GV** is closed (in PanelMate **S800vac.ui page 07**) to isolate focal plane vacuum chamber from the rest of the beamline | ||
* Confirm that the focal plane chamber is under vacuum | * Confirm that the focal plane chamber is under vacuum | ||
- | * Confirm that the only open gas handling system valves are **4, 5, 6, 20, 21, and 22** | + | * Confirm that the only open gas handling system valves are **4, 5, 6, 7, 20, 21, 22 and 23** |
* (Check section on [[vacuum control|vacuum control]] for further details.) | * (Check section on [[vacuum control|vacuum control]] for further details.) | ||
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* The display unit for the pressure at the pump has a needle indicator and is mounted under the [[Stations# | * The display unit for the pressure at the pump has a needle indicator and is mounted under the [[Stations# | ||
* Ensure that the main valves on the gas bottles are open (see pictures below) | * Ensure that the main valves on the gas bottles are open (see pictures below) | ||
+ | * Open valves downstream of regulators in each bottle | ||
* Ensure that the gas bottles are not empty | * Ensure that the gas bottles are not empty | ||
* The gas regulators are not normally adjusted. They should all be set to provide a pressure around 20 psi | * The gas regulators are not normally adjusted. They should all be set to provide a pressure around 20 psi | ||
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* Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system | ||
- | * Close **valve 6** | + | * Close **valves |
* Open **valve 2**; the flow reading at MFC #1 should jump momentarily | * Open **valve 2**; the flow reading at MFC #1 should jump momentarily | ||
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* Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system | * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system | ||
- | * Close **valve 22** | + | * Close **valves |
* Open **valves 10 and 15** | * Open **valves 10 and 15** | ||
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* Open **valves 5 and 21** | * Open **valves 5 and 21** | ||
- | * **IMPORTANT:** CLOSE **VALVE 25** to protect CRDCs from Ion Chamber pressure | + | * **IMPORTANT**: Before opening valve 8 (next step), |
* Empty Ion Chamber to a pressure at or below the pressure of the CRDCs | * Empty Ion Chamber to a pressure at or below the pressure of the CRDCs | ||
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* Close **valves 8 and 24** | * Close **valves 8 and 24** | ||
- | * Open **valves 6 and 22** | + | * Open **valves 6, 7, 22 and 23** |
- | * Enter S3 vault and close valves downstream of regulators in [[# | + | * Enter S3 vault and close valves downstream of regulators in [[# |
===== Tracking Gas bottles pressures ===== | ===== Tracking Gas bottles pressures ===== |